The achievable uncertainty for balance-based force standard machines in the range from micronewton to newton

Jens Illemann

Abstract

At PTB, a force standard machine (FSM) has been investigated which uses electromagnetically compensated balances (ECBs) with a full range of 10 N or 2 N respectively, for reaction force compensation of force transducers. This should enable the calibration and measurement capability of force transducers with a range from 1 mN to 10 N. The facility has been completely redesigned to allow the measurement with the load button upwards in compression direction.<br />In this contribution, the uncertainty budget for the measurement of an exemplary transducer with this new FSM will be elaborated. The estimation is done in compliance with the GUM and ISO 376 for different measurement procedure scenarios. Measurement results of this transducer gained before and after the redesign of the facility prove their reliability. The observed hysteresis and zero value residual are explained with simulated values which are based on the measured step-response function of the transducer.

Keywords

force standard machine, traceability, small forces, force transducer, ISO 376, electromagnetically compensated balance

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IMEKO-TC3-2007-KL-023u.pdf

DOI

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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